Design device of interstage air-entrapping structure of centrifugal compressor

Abstract

The invention provides a design device of an interstage air-entrapping structure of a centrifugal compressor. The design device of the interstage air-entrapping structure of the centrifugal compressor comprises a first design module. An air-entrapping hole is arranged on the curve of the centrifugal compressor with at least one stage. The air-entrapping hole is further provided with an air-entrapping structure so that air-entrapping airflow can be introduced. The air-entrapping structure comprises an air-entrapping spiral housing and an air-entrapping guiding vane. An air-entrapping spiral housing design module is used for designing a cross section of the air-entrapping spiral housing. A vane-shaped design module is used for designing a vane shape of the air-entrapping guiding vane. According to the design device of the interstage air-entrapping structure of the centrifugal compressor, when the number of a vane wheel is multiple, the spacing in the axial direction of the compressor is shortened, so that the critical speed of revolution of a machine set is easier to be exceeded.

Description

technical field [0001] The invention relates to the technical field of centrifugal compressors, in particular to a design device for an interstage air-filling structure of a centrifugal compressor. Background technique [0002] Due to the continuous expansion of petrochemical production scale and the increasingly complex chemical process, centrifugal compressor units often need to add gas somewhere between stages in process devices such as large ethylene and large chemical fertilizers. If the gas filling structure is not designed properly, it may cause a large distortion in the flow field of the mixed gas outlet. Since the current development of the basic stage is based on the design of uniform flow conditions, the inhomogeneity of the inlet flow field of the next stage directly causes the inlet angle of the blade to change in a wide range, which will not only affect the efficiency of the stage, but also cause rotation in severe cases. Severe air pulsation phenomena such as...

AI Technical Summary

Problems solved by technology

If the gas filling structure is not designed properly, it may cause a large distortion in the flow field of the mixed gas outlet

Since the current development of the basic stage is based on the design of uniform flow conditions, the inhomogeneity of the inlet flow field of the next stage directly causes the inlet angle of the blade to change in a wide range, which will not only affect the efficiency of the stage, but also cause rotation in severe cases. Severe air pulsation phenomena such as stalling will make the unit unable to work normally, directly affecting the reliability and economy of the device

Due to the complexity of the gas filling structure and the increasing number of such products, it is time-consuming and labor-intensive to use the CFD method to design each time

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